Title: Quantum transport enabled by vibrations and non-adiabatic transitions

Abstract: Quantum transport of charge or energy in networks with discrete sites is a core feature of diverse prospective quantum technologies, from molecular electronics over excited atoms to photonic metamaterials. In many of these examples, transport can be affected by motion of the sites or coupling to phonons. In the first part of the talk, we discuss a regular linear chain waveguide that encounters a trimer side-unit containing a mobile site. For suitable parameters, spectral regions which are opaque in the static case can be rendered transparent when vibrations are included. To see this, we developed a multichannel quantum scattering approach which can determine reflection and transmission probabilities in the presence of vibrations. Using that, the switch from opaque to transmitting appears as modification of the Fano resonance structure. Using a complementary time-dependent view time-dependent picture, we trace all transmission back to non-adiabatic transitions. Finally we also discuss the opposite scenario, where quantum transport is strongly enhanced due to adiabatic following of a quantum state. We explore this concept in molecular aggregates with intermolecular motion and discuss a criterion for the quantification of the adiabaticity of transport.

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